Electromagnetic relay



J1me 1931,, c. E. J NzLsoN ELECTROMAGNETIC RELAY Filed Aug. 22, 1929 2 Sheets-Sheet l June 30, 1931.

c. E. J NILSON ELECTROMAGNETIC RELAY Filed Aug. 22, 1929 2 Sheets-Sheet 2 k;- u was n 4% E C Patented June 30, 1931- UNITED STATES PATENT oFF l'C-E CARL ERIK JEAN NILSON, OF STOCKHOLM, SWEDEN, ASSIGNOR TO TELEFONAKTIE- IBOLAGET I. M. ERICSSON, OF STOCKHOLM, SWEDEN, A COMPANY OF SWEDEN ELECTROMAGNETIC RELAY Application filed August 22, 1929, Serial No. 387,739, and in Sweden August 24, 1928.

The present invention relates to electromagnetic relays provided with an U-shaped or similar magnet core. More especially the invention refers to such relays in which the a magnet core consists of a stamped out, prefup flange 5 for erably plane plate piece. The invention has for its object to provide improved means for pivoting the armature on the magnet core in order to facilitate the application of cheap manufacturing methods suitable in mass production. The invention is substantially characterized by the disposition of the armature inside a pocket. or the like formed by the magnet core and a thereto fixed plate in the bottom of which pocket the armature is so pivoted that it is swingable about an axis parallel with aplane through the legs of the magnet core.

The invention will be more closely described with reference to the accompanying drawings in which Fig. 1 is a side elevation, Fig. 2 a plan view andFig. 3 an end view of a relay according to the invention. Fig. 4 is an assembly of the magnet core and the magnet coil. Fig. 5 is a side elevation, Fig. 6 a plan view, and Fig. 7 an end view of another embodiment. Fig. 8 shows the magnet core in the latter embodiment. Fig. 9 is an end view and Fig. 10a side view of a diiferently designed relay provided with an elastic arrangement for the armature according to a modified embodiment. I

In the embodiment according to Figs. 1 to 4 the magnet core consists of a stamped out sheet metal piece 1, forming three legs 2, 3, 4. The rear ed e of said piece forms a bent fixing the relay to a support. The magnet coil 6 is disposed on the middle leg the magnet flux then being branched through the legs 2 and 4. The magnetcore is thus substantially of the E-shaped type. The armature 7 consists of a rectangular sheet metal piece which is disposed across the front ends of the legs 2, 8, 4 and pivoted inside a substantially wedge-shaped pocket or the like formed by one of the magnet legs and a late 8. The plate 8 consists of a stampe out sheet metal piece which. by means of screws 9 is secured to the bottom side of the magnet core at the outer ends of the legs in such a manner that the legs at the same time are rigidly united with one another. Said sheet metal piece is bent over the front edges of the legs in such a manner that the portion of said piece positioned above the magnet core forms an angle with a plane through the legs of the magnet core. In this Way apo'cket is formed between the plate 8 and the magnet core which pocket turns its opening towards'the magnet coil and the bottom edge of which is perpendicular to the legs of the magnet core. Inside this pocket the armature 7 is disposed in such a manner that it is swingable about an axis extending close to and-parallel with the bottom edge of the pocket the bottom of which thus forms a groove which serves as a hearing for the armature in such a manner that the armature, on the one side, is supported by the plate 8 and, on the other side, by the legs 2, 3, 4. The armature is supported by the plate 8 through the intermedium of two wire springs 10, 10 which by their one end are connected to the plate 8 by means of screws .11 and by their other ends are united with the armature close to its axis of rotation by means of screws 12 the heads of which extend through holes 13 in-the plate 8. By said springs the armature is normally held bearing agains the inside of the plate 8.

The contact springs of the relay in the shown example constitute two sets of contacts 14, 15 which are disposed on the bottom side of the legs 2, 4 and secured to an insulating piece 16 which in turn is secured to the magnet core. The contact springs are actuated in the usual manner by means of studs 17, 18 in ordinary manner extending through holes in the legs 2, 4. By means of an ad]usting screw 19 tapped into the plate 8 the distance between the plateand the mag net core is adjustable to the extent allowed by the flexibility of the plate 8 in order to the cost of manufacturing being thus considerably reduced.

The embodiment according to Figs. 5 to 8 differs from the above described embodiment substantially only in that the magnet core has only two legs 3, 4 and in that the armature is swingably disposed about an axis parallel with the longitudinal direction of the legs. The plate 8 is'for this reason secured to the side edge of the leg 3. Otherwise the mounting of the armature in relation to the plate 8 is the same as described above- The adjustment screw 19 bears in this case against a projection 21 on the leg 4. The relay is intended to be secured to a support by means of a bolt 22 riveted to a magnet core.

Figs. 9 and 10 show the application of the above described elastic arrangement for the armature in a differently designed relay. In

the shown example, the armature 23 is pivoted on a back strap 25 rigidly secured to the magnet core 24. The spring actuating the armature consists of a steel Wire piece 26 which by its one end is securedto the armature close to its pivotby means of a screw 27 and, by its other end, isinserted into a hole in an adjustable support 28 consisting of a plate washer which by means of a screw 29 is secured to a fixed member 30 which may form part of the relay support or of the magnet core. By thespring power in the spring 26 the armature is normally held bearing against the spring which may be set in different positions by turning the washer 28.

I claim: I

1. An electromagnetic relay comprising a flat iron core having three legs arranged with their broad sides parallel with a plane through said legs, a coil on the middle one of said legs, and a flat iron armature mounted on the one side of the legs and swingable about an axis parallel with the core plane and perpendicular to the legs.

2. An electromagnetic relay comprising a flat iron core having three legs arranged with their broad sides parallel with a plane through said legs, a coil on the middle one of said legs, and a flat iron aunature mounted on the one side of the legs and 'swingable about an axis perpen lar tog-the legs and located at the outer e of thelegs so as t. be attracted against sides'of the le 3. An electromagnetic relay co ing, a

flat iron core having three legs arranged with their broad sides parallel with a plane through said legs, a coil on the middle one of said legs, a fiat iron armature mounted on; the one side of the legs and swingable about an axis arallel with the core plane and pe pendicu ar to the legs, and sets of.conta springs arranged on both sides of the coil and mounted on the two outer, legs.

4. An electromagnetic relay comprising a flat iron core having three legs arranged with their broad sides parallel with a plane through said legs, a coil on the middle one of said legs, a flat iron armature mounted on the one side of the legs and swingable about pendicular to the legs, sets of contact springs arranged on both sides of the coil and mounted on the two outer legs, said outer legs having holes therein, and means for operating said spring sets projecting through holes; in said outer legs.

5. An electromagnetic relay comprisinga flat iron core having legs arranged with their broad sides parallel with a plane through said legs, a coil on one of said legs, a flat iron armature mounted on the one side of the legs and swingable about an axis parallel withthe core plane, and a non-magnetic support for said armature consisting of a plate rigidly secured to the iron core so as to form with the sides of the legs a wedge-shaped pocket in the bottom of which the armature is pivoted, said plate being adapted to form an abutment for the armature and a fixture for the counter-spring of the armature.

6. An electromagnetic relay comprising aflat iron core having legs arranged with their broad sides parallel with a plane through said legs, a coil on one of said legs, a flat iron armature mounted on the one side of the 1e and swingable about an axis parallel wit the core plane, a. non-magnetic support for to the plate by means of springs securedto the plate and united with the armature close to its swinging axis.

8. An electromagnetic relay comprising a flat iron core having three legs arranged'wlth their broad sides parallel with a plane through said legs, a coil on the middle one of said legs, a flat iron armature mounted on the one side of the legs and swingable about.

an axis parallel with the core plane and per-. pendicular to the legs and a non-magnetic support for said armature consisting of a plate arranged to form with the sides, of the legs a wedge-shapedpocket in the bottom of ion which the armature is pivoted, and secured to the core so as torigidly unite the ends of the legs. w

9. An electromagnetic relay as claimed in no side of the magnetcore and bent over band the edge of said core in such a manner that the wedge-shaped pocket is formed on the other side of the magnet core.

In testimony whereof I aflix my signature.

CARL ERIK JEAN NILSON.

laim 8, in which the plate is secured to the 

